Street and Lafayette Street and a new passageway under Reade Street was built connecting to the Chambers Street station on the BMT Nassau Street Line. At the center of the enlarged platforms, a new overhead passage was built, providing more direct access to the Municipal Building. A signal tower, as well as maintainers' rooms, relay rooms, and tile walls on the unused western side platform, were completed in May 1960. The tile walls on the unused eastern side platform had been completed the previous December. The downtown platform was lengthened in 1961, and the uptown platform's extension opened the next year, on September 1, 1962. The platform extension project was substantially completed by the end of 1963. The platform extensions allowed the old platform extensions at the southern end of the station, which were used for express service, to be abandoned. These platform extensions had necessitated the use of gap fillers. This project, which cost $6 million, allowed trains on the 6 route to be lengthened to nine cars, and allowed express trains to open all doors at the station (previously the doors only opened in eight of the ten cars). Upon its completion, the Worth Street station to the north was closed due to its close proximity to the platform extensions, and the Brooklyn Bridge station was renamed Brooklyn Bridge–Worth Street. Three elevators opened in 1992, making the station compliant with the Americans with Disabilities Act of 1990. The elevators cost $3.4 million (equivalent to $ million in ) and connected the mezzanine to the street and to each platform. The station's name was reverted to Brooklyn Bridge–City Hall in 1995. A renovation at the station was completed by 1996. It was one of thirteen stations citywide whose renovations were completed that year at a total cost of $127 million (equivalent to $ million in ). BMT Nassau Street Line Construction and opening After the original IRT opened, the city began planning new lines. The Centre Street Loop (later the Nassau Street Line) was approved on January 25, 1907, as a four-track line; it was to connect the Brooklyn Bridge, Manhattan Bridge, and Williamsburg Bridge via Centre Street, Canal Street, and Delancey Street. Construction contracts for the Nassau Street Line were awarded in early 1907. A proposed Tri-borough system was adopted in early 1908, incorporating the Broadway Line. Operation of the line was assigned to the Brooklyn Rapid Transit